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Preparation method of coal ash-based sound-absorbing material

A technology of sound-absorbing materials and fly ash, which is applied in the field of waste treatment and disposal in the energy industry, and can solve problems such as waste of resources

Inactive Publication Date: 2013-02-13
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the different origins of raw coal, its composition varies greatly, resulting in large differences in the composition of the same type of fly ash. The current utilization of fly ash in many fields is to directly use raw ash as raw material, resulting in waste of resources.

Method used

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  • Preparation method of coal ash-based sound-absorbing material
  • Preparation method of coal ash-based sound-absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] according to figure 1 As shown, the fly ash, quartz powder, special foaming agent and activator are dried, and 50% of fly ash, 20% of quartz powder, 20% of foaming agent, and 10% of activator are mixed according to the mass fraction Put it into a ball mill, and grind it to below 200 mesh; add 10% water to the mixer and mix it evenly; put the evenly mixed powder into a steel mold and press it into a machine, and the molding pressure is 10MPa; The good green body is fired in the muffle furnace. Dry at 105°C for 30 minutes, then heat from 105°C to 800°C at a speed of 17.4°C / min, then raise the temperature to 1080°C at a speed of 9.5°C / min and keep it for 20 minutes. Take it out of the furnace and let it cool naturally. Cut the cooled porous material into required size as required. The photo of the prepared fly ash porous sound-absorbing material is shown in figure 2 , the density of the sound-absorbing material is 450kg / m 3 , the compressive strength is 1.5MPa, and t...

Embodiment 2

[0012] Dry the fly ash, foaming agent and activator, add 70% of fly ash, 20% of rice husk ash, and 10% of cement into the ball mill according to the mass fraction; Add 10% water in the mixer and stir evenly; put the evenly stirred powder into a steel mold and press it into a machine, and the molding pressure is 10MPa; put the formed green body into a muffle furnace for firing. Dry at 105°C for 30 minutes, then heat from 105°C to 800°C at a rate of 17.4°C / min, then raise the temperature to 1090°C at a rate of 9.5°C / min for 20 minutes, and then wait for the furnace temperature to drop to 500°C from Take it out of the muffle furnace and let it cool naturally. Cut the cooled porous material into required size as required. The density of the prepared fly ash porous material is 400kg / m 3 , the compressive strength is 6MPa, and the porosity is 80%.

Embodiment 3

[0014] The specific process includes: (1) Mix fly ash, quartz powder, self-made special foaming agent, activator and adhesive, dry them evenly, add them into a ball mill and mill them below 200 mesh, and the proportion of ingredients is (by weight): Fly ash 50kg, quartz powder 5kg, self-made foaming agent 10kg, self-made activator and binder 10kg. (2) Add 10% water to the ball-milled powder in the mixer and stir evenly. (3) Put the evenly stirred powder into a steel mold and press it into a machine, and the molding pressure is 5 MPa. (4) Put the shaped green body into the muffle furnace for firing, preheating stage: dry at 105°C for 30 minutes to remove moisture in the green body; heating stage: heat up to 1080°C in 60 minutes, and Keep the temperature for 30 minutes at the firing temperature; cooling stage: the fired porous material is cooled to 500°C in the furnace, then taken out from the muffle furnace, and cooled naturally. (5) The annealed porous material is cut and pr...

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Abstract

The invention relates to a method for preparing a sound-absorbing material by using the coal ash as the main material aiming at the current situation of large coal ash amount, extensive utilization way and serious resource waste in the energy industry of China. The specific process comprises the following steps of: evenly mixing coal ash and a home-manufactured special compound auxiliary and drying, shaping after grinding, and then performing thermal treatment and subsequent processing, wherein the density of the prepared coal ash porous sound-absorbing material is 400kg / m<3> to 600kg / m<3>, the compressive strength is 1.5MPa to 6MPa, and the porosity is 70-80%. The material can be used as the sound-absorbing and sound-insulating panels for high-speed railways, high-speed roads, metro, building walls, and the like, and the sound-absorbing performance of the sound-absorbing material meets the requirement of road sound barrier sound-absorbing materials.

Description

technical field [0001] The invention relates to the treatment and disposal of waste in the energy industry, belongs to the new technology of resource utilization of solid waste in the field of environmental protection and resource comprehensive utilization, and is especially suitable for the environmental protection and high value-added resource utilization of high-silicon and aluminum-containing solid waste. The prepared sound-absorbing material is mainly used for sound absorption and insulation of high-speed railways, expressways, subways, building walls, etc. Background technique [0002] Noise pollution, together with water pollution and air pollution, is called the three major contemporary pollutions. With the rapid development of the transportation industry and the construction industry, the problem of noise pollution is becoming more and more serious. It will not only affect people's normal life and work, but also bring great harm to social development. Therefore, no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/02C04B28/00
CPCC04B28/02C04B18/08Y02W30/91C04B14/06C04B38/0074C04B38/02C04B40/0071C04B18/105
Inventor 张付申邢明飞王川
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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